I was a member there for a couple of years. They are just west of Missoula kind of off the 'Big Flat' area and then along the river.
Here's a google map link with an approximate marker:
Untitled - Google Maps
Deep Creek Range is one of Hellgate Civilian Shooters Association ranges. Click on their link for membership and other info:
http://hellgatecsa.org/index.html
There is a 1K range there, but you must (last I knew) join a separate 1K club to use it on certain days/times. There have been some phenomenal groups shot there and quite a very few top end shooters shoot that 1K range. Duane Capehart runs the 1K portion. There is a 100 and 200 yd public range ($2, I think) and a number of other ranges out to 500yds (w/ a gong or two on a tree out to 700 or so--nailed them a few times). Pretty nice range all in all.
Hope this helps.
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